Auto Service Professional

APR 2018

Magazine for the auto service professional

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34 | ASP April 2018 Technical is brought into the A/C machine. As a specific example, the new Robinair A/C1234-4 machine comes with a built-in internal refrigerant identifier that samples refrigerant prior to recovery to ensure the refrigerant is not contaminated before it is brought into the A/C machine. Refrigerant must be at least 98% pure prior to recovery and recharging. Servicing R-1234yf systems also requires technicians to manually inject oil into the system. Before injecting oil into the system, technicians should review OEM requirements and use the manufacturer-recommended oil. Hybrid R-134a Electric hybrid vehicles typically incor- porate an electric compressor. ese types of vehicle A/C systems use a different type of lubricant oil, POE, than what is found in a traditional belt driven compressor A/C system. With the different oil types, industry requirements were created for A/C RRR equipment to ensure the equipment could service both types of systems safely and effectively. With RRR equipment designed to service both hybrid and standard belt-driven types of A/C systems, some expected features like onboard oil injection are no longer available. is is done to eliminate the chance of cross- contaminating vehicle A/C systems with the wrong type of oil as a tech switches between servicing a standard vehicle and an electric hybrid vehicle. POE oil is required because it is non- conductive. Using the wrong oil can cause the systems to seize up or fail, with some manu- facturers not allowing the system to operate if it senses any amount of electrical conductivity within the compressor. Leak detection Electronic leak detectors typically have a sensor that reacts to refrigerant and triggers an alarm so the user knows they are close or have found the source of the leak that needs to be repaired. As an example, the Robinair LD7 leak detector includes both an audible alarm and an LCD display that alerts and shows the user the amount of refrigerant being detected, which helps pinpoint the exact location of the leak. e flexible wand/probe allows the user to search for leaks in hard-to-reach places where other leak detection methods don't perform well. With widespread adoption of R-1234yf, shops may need to upgrade their leak detectors to one that will "sniff" the new refrigerant. Newer leak detectors will help locate leaking R-1234yf and most other refrigerants. e new unit displays a proximity meter, helping techs sweep lines and systems to pinpoint the exact location, with the detector displaying approximate proximity to the leak. An LED search light and UV light aid in spotting damaged components or spotting fluorescent UV dye leaking from a system. PAG vs. POE When servicing vehicles with A/C RRR equipment, sometimes oil is removed during An example of a refrigerant recovery system for R134yf (Mahle ActicPro ACX1280). Features include a fully automatic program to recover, vacuum, leak test and charge without command; a vacuum leak test; automatic air purge; integrat- ed refrigerant identifier to avoid costly cross-con- tamination, with a clearly visible sample filter for inspection; automatic oil drain integrated hose flushing that eliminates the need for additional or loose adapters; an on-board thermal printer; tool tray; and fan flow ventilation switches to maintain cabinet venting. Photo courtesy of MAHLE Service Solutions

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